If your account has been identified as a Pattern Day Trader and you are entitled for a reset, you will be supplied with a link to the PDT reset tool if you seek to enter an order using the TWS. On the other hand, you may request a reset by logging in to the Client Portal/ Account Management and selecting Messages from the menu. Click the Compose button and select Pattern Day Trader Request. If your account is entitled for a reset, you will be assisted through a series of steps to acquire a reset.
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If you do not see an option to request a reset, please see:  Why can't I submit a Pattern Day Trade reset request?

More  information on PDT restrictions can be found in our Knowledge Base.